Viruses

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Viruses

Read the questions and answers CAREFULLY

First Name *

Last Name *

Period *

Which of these describes a difference between viruses and cells? *

1 point

A) Cells contain protein, and viruses contain only carbohydrates

B) Viruses have flagella, and cells have only cilia

C) Cells reproduce independently, and viruses require a host to reproduce

D) Viruses have membranes made of proteins, and cells have membranes made of nucleic acid

Viruses can be transmitted through air, water, food, insect bites, and direct skin contact. Once a virus gains entry to the body, it invades a host cell in order to - *

1 point

deactivate the host cell's defenses

synthesize antibodies for defense

metabolize host proteins and grow

access cellular processes for replication

Which viral life cycle kills its host cell by bursting? *

1 point

lytic

mitosis

lysogenic

S phase

When a virus invades a living cell, its _______takes over the cell's functions. *

1 point

outer coat

genetic material

core

cytoplasm

What part of a virus is the protein capsule that surrounds the genetic material (DNA/RNA)? *

1 point

tail

nucleus

capsid

glycoprotein

The Human Immunodeficiency virus (HIV) is very specific to immune cells. A person infected with this virus may not have any symptoms for a period of time. During this period the virus affects the body by doing which of the following? *

1 point

A) The virus produces toxins that weaken immune cells and prevent them from reproducing

B) The virus damages immune cells while using their machinery to produce copies of itself

C) The virus uses nutrients meant for immune cells to fuel its own cellular respiration

D) The virus changes the identity of the nucleotide of immune cells to prevent the immune system from functioning normally

What do viruses need to reproduce? *

1 point

They need genetic material

They need a host cell

They need bacteria

They need insulin

Why do some viruses seem to go away and then return later, like a cold sore? *

1 point

host has been infected with a different kind of virus

the immune system forgot the virus

the virus has entered the lysogenic cycle

the virus mutated

In the 1880s, Louis Pasteur developed a method of weakening viruses. The weakened viruses could be injected into healthy individuals. How is this method effective in fighting viral diseases? *

1 point

The immune system develops antibodies in response to the weakened viruses

The weakened viruses attach to unaffected viruses in the host and interrupt the viral reproductive cycle

The rate of genetic mutation in the host is decreased due to the introduction of weakened viruses

Weakened viruses are unable to enter the host organism

A virus can be classified by its type of *

1 point

mitochondria

chromosomes

nucleic acid (DNA and RNA)

carbohydrates

A(n) _____ is a virus that enters a bacterial cell. *

1 point

Decomposer

Bacteriophage

Endospore

Plasmid

Watch one of the flipgrid videos made by a STUDENT (not teacher) and then write below whose video you watched, their virus name, and what you learned about that virus. Link: https://flipgrid.com/fc218ae2 *

3 points

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